炭纤维中微孔在模拟复合材料石墨化过程中的演变

吴刚平1; 李登华1; 杨　禹1; 吕春祥1; 张寿春1; 徐　耀2|李秀涛3; 冯志海3; 李志宏4; 吴中华4

doi:10.1016/S1872-5805(14)60124-4

炭纤维中微孔在模拟复合材料石墨化过程中的演变

doi: 10.1016/S1872-5805(14)60124-4

中国科学院山西煤炭化学研究所炭纤维制备技术国家工程实验室,山西太原 030001; 2.中国科学院山西煤炭化学研究所中国科学院炭材料重点实验室山西太原 030001; 3.航天材料与工艺研究所先进功能复合材料国家工程实验室北京 100076;4.中国科学院高能物理研究所同步辐射实验室北京 100049

基金项目: 国家自然科学基金(51002165, 11079041)；中国科学院山西煤炭化学研究所杰出青年人才培养计划(2011SJCRC09).

详细信息

中图分类号: TQ342.⁺74
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出版历程
- 收稿日期: 2013-08-09
- 录用日期: 2014-02-24
- 修回日期: 2014-01-07
- 刊出日期: 2014-02-28

Microvoid evolution in carbon fibers during graphitization for the preparation of carbon/carbon composites

National Engineering Laboratory for Carbon fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China |2.Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;3.National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials &|Processing Technology, Beijing 100076, China;4.Synchrotron Radiation Laboratory, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Funds: National Natural Science Foundation of China (51002165, 11079041); Distinguished Young Reasearch Talent Training Program of Institute of Coal Chemistry, Chinese Academy of Sciences (2011SJCRC09).

摘要

摘要:
将聚丙烯腈基炭纤维在石墨化炉中维持定长加热，以模拟炭/炭复合材料制备过程中炭纤维结构的变化，并采用小角X射线散射(SAXS)和高分辨透射电子显微镜(HRTEM)检测石墨化过程中的结构演变。随着温度的提高炭纤维中微孔的平均回转半径、长度、宽度、截面积和体积分数呈现先减小后增大的趋势，并在约2300℃出现极小值。炭纤维中孔隙尺寸的变化与炭层片的活动性密切相关。炭层的缩合和有序化导致孔隙率的减小，而炭层在更高温的簇状化导致孔隙尺寸的增大。
- 炭纤维 /
- 小角X射线散射 /
- 炭层结构 /
- 石墨化
Abstract:
Polyacrylonitrile-based carbon fiber bundles, with two sides fixed, were heated in a graphitization furnace with temperature profiles similar to those used in the preparation of carbon/carbon composites. The microstructure of the microvoids formed was characterized by small-angle X-ray scattering and high resolution transmission electron microscopy (HR-TEM). Results showed that the average radius of gyration of the microvoids decreases, and their length, width, cross-sectional area and volume fraction decrease followed by a slight increase with increasing temperature, with the minima found at around 2300℃. The HR-TEM images showed that the microvoids were formed by stacking defects of the carbon layers. The ordering of the amorphous carbon layers accounted for the initial decrease of size and volume fraction of the voids with increasing temperature, while the growth and ordering of the layers at high temperatures gave rise to increases in their size and volume fraction.
- Carbon fibers /
- Small-angle X-ray scattering /
- Carbon layer structures /
- Graphitization